<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

    </style>
</head>
<body>
    
</body>
</html>
<script>
    function computed(str) {


         var newstr2 = ''
         for (var i = 0; i < str.length; i++) {
             if (str[i] == ' ') {

             } else {
                 if (str[i] == '!') {
                     newstr2 += '啊'
                 } else if (str[i] == 'h') {
                 newstr2 += 'H'
             } else if (str[i] == 'w') {
                 newstr2 += 'W'
                  } else {
                 newstr2 += str[i]
             }
             }

     }
     let newstr1 = newstr2.split("").reverse().join('')
     return newstr1
     }
     console.log(computed(' hello world 我爱你!'));
</script>